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Transactions with Total and Total S.A. - Narrative (Details) - Total - USD ($)
$ / shares in Units, $ in Billions
1 Months Ended 9 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Sep. 27, 2020
Related Party Transaction [Line Items]      
Ownership after sale of stock, percentage     52.00%
Tender Offer Agreement      
Related Party Transaction [Line Items]      
Ownership after sale of stock, percentage   60.00%  
Consideration received in cash tender offer (in dollars per share)   $ 23.25  
Cash tender offer   $ 1.4  
Private Placement      
Related Party Transaction [Line Items]      
Ownership after sale of stock, percentage 66.00%    
Consideration received in cash tender offer (in dollars per share) $ 8.80    
Number of shares of common stock issued and sold 18,600,000